Angle-cutting guide for lathes



G. A. MAGNUSON.

ANGLE CUTTING GUIDE FOR LATHES.

APPLICATION man OCT. 16, 1920.

1,435,408, v Patnted Nov. 14,1922.-

Patented Nov. 14-, ieaa.

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angle-cutting guides for lathes, and it con-,

sists in the combinations, constructions and arrangements hereindescribed and claimed. An ob ect of my invention is to provlde a simpledevice which may be attached to a lathe, and by means of which devices,such as bevel gears, bevel rolls. etc., maybe reada ily and accuratelycut.

provide a device of the type described for cutting bevels by means of anordinary round nosed tool.

A further object of my invention is to provide a device which may bereadily attached to lathes of the existing types, or

removed therefrom at will.

A further object is to provide an angle cutting guide in which the anglemay be adjusted to various degrees.-

Other objects and advantages will appearin the following specification,and the novel features of the invention will be particularly pointed outin the appendedclaims.

My invention is illustrated in the accompanyingdrawings, forming part ofthis ap-' plication, in which Figure 1 1s a plan view of a portion of alathe with my improved angle cutting guide in position,

F1gure2 1s anenlarged sectional view of a guide, and

Figure 3 is an enlarged sectional view a through a swivel. a

In the drawing, the head stock of the lathe is shown at 1. At 2 I haveshown a hinge block which is secured to the head stock by means ofscrews 3. The hinge block has pivotally secured thereto, at, 4, a guidebar 5, this guidebar being preferably made or two separate pieces boltedtogether byv bolts, such as those shown at 6 and 7 The outer end of theguide block is recessed at 8 to receive a swivel block 9, having pivotlugs 10 which extend through openings in the'guide bar. One of thesepivot lugs is threaded to receive a lock nut 11 (see Fig ure 3).

A further object of my invention is to l Arod 12 3s threaded atandpasses through a threaded opening in the swivel block 9; I v therein,against which the block bears. Each end of the rod is provided with aslot- 15,

by means of which the rod may be turned to move it with respect to theswivel head.

Arrangedto cooperate with. the guide bar'5 is a roller 161c arried by anarm 17,

which has a reduced threaded portion 18 The rod has a nut '14 disposedarranged to enter the boss 19, of the carriage 3 .20, which ordinarilycarries the stock gauge. 1

This gauge mayfberemoved andthe arm 17' secured to the carriagevin placethereof;

From theforegoing description of the various parts of the device, "theoperation 7.

thereof may be readily understood; In

Figure l, I haveshown the work at'21.

After; determining the. angle which itfis desired to 'cut'on the work,the guide bar the nut 11 and swinging the guideabar on the hinge Pivotit tov'the P p r angle, and 80,

then screwing the rod 12'nntil it rests against the cross bar 22 on thehead stock .5 is set at, this angle by'first unloosening of the machine.The nut 14 thenis'tightgl guide; bar in its operative position. Thecarriage may now bemoved to bring the tool "cried and also the nut 1O,so as to lock the a v 23 into engagement with the work. The 1 roller 16will be g'uidedalong the outer edge of the guide bar, so that the toolwill follow [the angle which the guide, bar makes, i:'rorn a the outeredge" ofthework to the inner portionthereof,thus accurately cuttin g thedesired angle.

W'hen itgis, desired jto'cut another anglefj' the rod;12; and the swivelheadj9 are adjusted as heretofore described for the angle desired.

are not liable toeasily get out'o f order.

The use of the {device insuresjaccuracy in. cuttingbevels', and at thesame b11116,- does not require, close application on the part ofthe.operator, since the roller,;in followmg the guide bar, nsures accuratework.

I claim: I

'1. The combination with a lathe having a carriage and a headstock, ofafplate The device: consists offew parts, which I i secured to said headstock,'a guide bar hav-Z ing a hinged connection tosaid plate, said gude bar consisting of separate plates clamped together, a swivel blockmounted between the outer ends of said plates, said, swivel block havinga threaded opening,

thrust rod having threads arranged to enter said opening, means forclamping said swivel block in any position with respect to the guidebar, a post rigidly secured to 5 said carriage, and a guide rollercarried by said post and arranged to travel along one edge of said guidebar.

2. The combination with a lathe having a carriage and a headstock, of aguide bar 10 adapted to be hingedly mounted on said head stock, saidguide bar having a swivel block mounted. on 1ts outer end, said swivelblock having a threaded bore therethrough,

said swivel bar in any position with respect to said. guide bar.

GUST A. MAGNUSON.

